JP2003242984A - Manufacturing device of storage battery grid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing device of a grid in which corrosion resistance of an expanded metal grid can be improved, while the manufacturing rate of the reciprocating type expanded grid is kept high. <P>SOLUTION: This is a manufacturing device of a storage battery grid in which, by moving upward and downward a plurality of upper blades the are arranged in step-shape along the running direction of the alloy sheet is order from the edge on a lead alloy sheet moving intermittently, cutting is made on this metal sheet and, by pushing and widening apart, square boxes are formed in net shape, leaving in the center or at the edge an undeveloped part. The upper blades of each step arranged in step-shape comprises two or more blades formed in a row along the running direction of the metal sheet, and the height of the blade tip of two or more blades of the upper blades at each step is different at least in one of the blades at each step in more than half of all steps, and the difference in the height is 1-20% of the height of the blade tip of the cutter on the higher side of each step. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an apparatus for manufacturing a grid for a storage battery.

[0002]

2. Description of the Related Art Conventionally, an electrode plate of a storage battery has been used in which an active material is held in a mesh lattice. As a typical method for forming the mesh lattice, there are a method by casting (cast lattice) and a method by expander (expand lattice). An expander is a device that forms squares by machining a lead sheet, and a rotary method of forming squares by making a number of cuts on this lead sheet and pulling from both sides to form squares. There are a reciprocating type and a reciprocating type in which the lead sheet is intermittently moved and a notch is made by the upper blade to spread the lead sheet in order.

Generally, the rotary system has a high production speed of the lattice, but is said to be inferior in strength and corrosion resistance of the lattice. The reciprocating system is slow in production of the lattice, but excellent in strength and corrosion resistance of the lattice.

The reciprocal expander shown in FIG.
As shown in, while moving the long lead sheet 1 indicated by the one-dot chain line intermittently in the direction shown by the arrow V on the lower blade metal fitting 2 on which a plurality of side surfaces 2a are arranged stepwise,
This is an apparatus for manufacturing a battery grid in which a grid is formed on the lead sheet 1 by vertically moving an upper blade fitting 4 to which a large number of upper blades 3 are attached. The upper blade metal member 4 is a metal member having a side surface 4a which is stepwise along the direction of the arrow V in the drawing from the end, and is actually arranged below the drawing and immediately above the lead sheet 1 and repeatedly by a high speed press. Move up and down. The upper blade 3 is a tool in which one blade 3a is formed at the lower end, and the upper blade 3 is attached to the side surface 4a of each step of the upper blade metal member 4 with a bolt or the like.
It is attached and fixed one by one.

In FIG. 1, in order to simplify the drawing,
The side surface 4a of the upper blade fitting 4 has only four steps, and these side surfaces 4a
Although the figure shows the upper blades 3 attached to a, the upper blades 3 are actually attached to the side surfaces 4a of a larger number of steps. Further, in FIG. 1, the upper blade fitting 4 and the lower blade fitting 2 are provided with stepwise side surfaces 4a and 2a on the front side and the back side of the drawing, respectively. Stepped side 4 on only one side
a and 2a may be provided.

FIG. 2 shows an example of the reciprocating expanded grid. In this expanded lattice, a plurality of squares 1a are formed on the lead sheet 1, and the active material is held in the squares 1a.

[0007]

Conventionally, as shown in FIG. 1, one upper blade 3 having one blade 3a is attached to a side surface 4a of an upper blade metal fitting 4 one by one. By one vertical movement of the above, the cells were formed one by one from the upstream side to the downstream side of the expanded lattice. However, if only one mass can be formed by one vertical movement, the manufacturing speed is slow. Therefore, the upper blade having the two blades 3a and 3b as shown in FIG. By installing 3 one by one, one vertical movement of the upper blade metal fitting 4 moves from the upstream side to the downstream side of the expanding lattice.
Attempts were made to form each square.

However, the two blades 3a as shown in FIG.
If only the upper blade 3 provided with 3b is attached, the expanded grid formed by this will bend the lower line (corresponding to the upper and lower ends of FIG. 2) as shown in FIG. 4, causing a problem when inserting the battery case. It was This issue is Japanese Patent Application 20
Upper blade 3 shown in FIG. 3 as described in 00-275854
Changing the height of the blades 3a and 3b of the blade, and Japanese Patent Application No. 2001
No. 338150, the problem can be solved by changing the shapes of the upper blades 3a and 3b shown in FIG. For details of the manufacturing process of the reciprocating expand grating, see Japanese Patent Application No. 2000-275854.
The issue is described in detail.

However, a battery using the expanded lattice manufactured in this way as a positive electrode is a battery as shown in FIG.
The life was about 10% shorter than that of the battery in which the expanded lattice manufactured using a single blade was applied to the positive electrode lattice. When it was disassembled, lattice corrosion of the positive electrode was more prominent than that produced by using a conventional single blade.

The present invention has been made in order to solve the above problems, and provides a lattice manufacturing apparatus capable of improving the corrosion resistance of the expanded lattice while keeping the production rate of the reciprocating expanded lattice high. .

[0011]

According to a first aspect of the present invention, which has been made to solve the above-mentioned problems, a lead alloy sheet is intermittently moved, and the lead alloy sheet is arranged stepwise along the traveling direction of the alloy sheet from the end. Manufacture of a storage battery grid in which a plurality of upper blades are moved up and down to make a notch in this metal sheet and spread it at the same time to leave a non-expanded portion in the center or end of the sheet to form a grid in a grid pattern. In the device, the upper blades of each step arranged in a stepwise manner are provided with two or more blades arranged along the traveling direction of the metal sheet, and the cutting edges of the two or more blades in the upper blades of each step. The height of each step is different in at least one of the blades of each step in more than half of all steps, and the difference in height is 1 to 20% of the height of the cutting edge of the blade on the high side of each step This is a manufacturing apparatus for a storage battery grid.

According to a second aspect of the invention, along the sheet traveling direction,
Except for the top blade provided in the final or first stage, the highest blade height of the top blade with two or more blades provided in each stage is continuous or stepwise along the sheet traveling direction. 2. The apparatus for manufacturing a storage battery grid according to claim 1, wherein the manufacturing apparatus for the storage battery grid is characterized in that it is gradually lowered.

A third invention is a grid for a storage battery manufactured by using the manufacturing apparatus according to claim 1 or 2.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventor has conducted various studies on the positional relationship between the two blades 3a and 3b of the upper blade 3 as shown in FIG. 3, and has shown that the expanded grid has excellent corrosion resistance while keeping the production speed high. The positional relationship between the blades 3a and 3b for manufacturing the was found.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 is a schematic view of a reciprocating type expanded lattice manufacturing apparatus, (A) is a plan view of the upper blade fitting 4,
(B) is a side view of the upper blade fitting 4, (C) is a lead sheet 1,
(D) is a side view of the lower blade fitting 2, and (E) is a plan view of the lower blade fitting 2. When viewed from the side, (B) in the figure,
(C) and (D) are arranged. However, in reality, (C) and (D) are in contact with each other, and the distance between (B) and (C) is narrower than in the figure. Further, as shown in FIGS. 5A and 5B, the upper blade member 4 is provided with the upper blade 3 having two blades 3a and 3b, but in FIG. Therefore, the main body of the upper blade 3 is omitted and only the blades 3a and 3b are shown. An upper blade fitting 4 shown in FIGS. 5 (A) and 5 (B),
Each of the lower blade fittings 2 shown in (D) and (E) is provided with a plurality of step-like steps (12 steps in the figure). Using this apparatus, the lead sheet 1 was subjected to reciprocal expand processing.

The items examined here are the difference in height between the blades 3a and 3b attached to the upper blade 3 and the arrangement of the upper blade 3. First, the definition of "the difference in height between the blades 3a and 3b" is clarified. FIG. 5 is a diagram for clarifying the definition in FIG.
An enlarged view of a main part of (C) and (D) (a part surrounded by X in FIG. 5) is shown. Reference numeral 4 in FIG. 6 is an upper blade fitting, and a blade 3a and a blade 3b are attached to one side surface 4a of the upper blade fitting. The straight line indicated by 4d indicates the lower surface of the upper blade member 4.
Reference numeral 2 is a lower blade metal fitting, and 2a is a side surface thereof. The straight line indicated by 2u indicates the upper surface of the lower blade member 2. Between the lower surface 4d of the upper blade member 4 and the upper surface 2u of the lower blade member 2, the lead sheet 1 intermittently advances from the upstream side (left side in the drawing) toward the downstream side (right side in the drawing). Here, FIG. 6 shows a case where the upper blade fitting 4 which moves up and down is at the bottom. As shown in the drawing, the lower surface 4d of the upper blade member 4 and the lead sheet 1 do not have to be in contact with each other, but may be in contact with each other. However, the tips of the blades 3a and 3b attached to the side surface 4a of the upper blade member 4 (lower side in the drawing) cannot be expanded unless they are below the upper surface 2u of the lower blade member 2.

The height of the blade 3a means, as shown in FIG. 6a, from the upper surface 2u of the lower blade fitting 2 to the tip (lower side in the drawing) of the lower blade fitting 2 when the upper blade fitting 4 is at the lowest position. It refers to the distance, and the height of the blade 3b means, as shown in FIG. 6c, from the upper surface 2u of the lower blade metal fitting 2 to the tip of the blade 3b (lower side in the drawing) when the upper blade metal fitting 4 is at the bottom. Refers to the distance. And the difference in the height of the blade means the height a of the blade 3a as shown in FIG. 6b.
And the absolute value of the difference between the height b of the blade 3b and the height b. In FIG. 6, the height of the blade 3a on the upstream side (the left side in the drawing) is drawn low, but the blade 3a can be increased. However, it seems that the lower height of the upstream blade is slightly better.

As described above, the heights a of the various blades 3a,
Upper blade 3 having a height c of the blade 3b and a height difference b of the blades
(Not shown in FIGS. 5 and 6) are each side surface 4a of the upper blade fitting 4.
Attached to the lead sheet, subjected to reciprocal expand processing on the lead sheet, to manufacture expanded grids of various shapes, filled the expanded grid with a positive electrode active material by a conventional method to form a positive electrode plate, the negative electrode plate and the separator manufactured by a conventional method. It laminated | stacked via and and it was set as the power generation element. When a storage battery equipped with this power generation element was subjected to a life test to evaluate the shape of a preferable expanded lattice, the following characteristics were found.

(1) At least half (6 or more in FIG. 5) of each step 4a of the upper blade fitting 4, the difference b between the height a of the blade 3a and the height c of the blade 3b is different. To use. (2) The difference in blade height is 1 to 20 with respect to the higher blade.
%, Preferably 5 to 15%, (3) The height of the higher cutting edge of the two blades 3a and 3b of each stage is the most upstream side and the most downstream side along the sheet advancing direction. Except for the blade of, it should be lowered continuously or in steps.

The expand lattice manufactured by the reciprocating expander having any one of the above (1) to (3) or a combination thereof is manufactured by the conventional reciprocating expander having a slow single blade manufacturing speed. It was possible to have a life performance equal to or higher than that of the expanded lattice. Although details of the reason are unknown, the above (1)-
Due to the feature (3), the distribution of stress applied to the lead sheet during cutting and expansion of the lead sheet became appropriate, and the crystallographic structure of the expanded lattice may have been able to maintain corrosion resistance. . The lead sheet described above refers to a sheet made of lead or a lead alloy.

[0022]

EXAMPLE Various top blades 3 (not shown in FIG. 5) were attached to each side surface 4a of an upper blade metal fitting 4 of a reciprocating type expanded lattice manufacturing apparatus having 12 steps of side surfaces 4a as shown in FIG. . The upper blade 3 is provided with one or two blades.
Details of various blades are shown in Tables 1 to 3. 1 to 12 in the leftmost column show the stages of the reciprocating type expanded lattice manufacturing apparatus, and 0 to 8 in the uppermost row show the test numbers in this example. The numerical value in the table shows the height (mm) of the blade.

Table 1 shows the difference d in height of the upper blades 3, Table 2 shows the influence of the number of steps in which the heights of the upper blades are different, and Table 3 shows This is an examination of changes in the height of the upper blade of the upper blade provided in each step.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

[Table 3]

The tested sheet had a thickness of 1.8 mm and an alloy composition of Pb-0.06% Ca-2% Sn-0.005% A.
1 of a lead alloy sheet, which was obtained by rolling a continuously cast slab having a thickness of about 12 mm with a pair of continuously arranged rollers. The development speed is 500 times / minute, and the feed pitch of a single-blade blade is 30 mm, which is 1.5 times the grid pitch,
The feed pitch of the two-blade blade was 50 mm, which was 2.5 times the pitch of the squares. In addition, the step size at each step is 1.8 m
m. The results of observing the shape of the cells 1a of the expanded lattice expanded by this method are shown in Tables 4 to 6.
Shown in.

[0028]

[Table 4]

[0029]

[Table 5]

[0030]

[Table 6]

That is, the heights of the cutting edges of the upper blades of the steps arranged in a stepwise manner are different in at least one of the blades of the steps in the half or more of all steps, and the difference in height is the difference of the steps. By setting the height of the cutting tool on the higher side to 1 to 20% of the height of the cutting edge, it was possible to reduce the variation in the size of the grid. Furthermore, by setting the difference in the height of the rough edges to 5 to 15%, it was possible to eliminate the variation in the size of the grid.

For reference, an expanded lattice manufactured by the method of Study No. 1 is shown in FIG. 7, and an expanded lattice manufactured by the method of Study No. 4 is shown in FIG.

Lead-acid batteries were prototyped using these expanded grids and their life performance was confirmed. The expanded lattice obtained as described above was pressed with a pair of rollers to a thickness of 3.7 mm, and this was filled with a predetermined positive electrode paste,
It was cut to a predetermined width and punched to form a current collecting ear portion. In this way, the obtained filled grid was subjected to a predetermined aging and drying step to obtain an unformed positive electrode plate. Here, as the positive electrode paste, a material obtained by kneading lead powder, red lead and short fibers with dilute sulfuric acid and water was used.

For the negative electrode plate, a lead alloy (Pb-0.1% Ca-with a sheet thickness of 1 mm was used by using an ordinary expanded lattice.
0.5% Sn-0.003% Al) is developed to have a thickness of 1.
What was pressed to 7 mm was used. After filling this with a predetermined negative electrode paste, an unformed negative electrode plate was obtained through the usual aging and drying steps. Here, the negative electrode paste used was a mixture of lead powder, lignin, barium compound, carbon, etc., with diluted sulfuric acid and water.

The positive and negative electrode plates thus obtained and the retainer mat mainly composed of fine glass fibers and having a liquid absorbing property were alternately laminated to obtain an element having four positive electrodes and five negative electrodes.
This element constituted a strap and a cell-to-cell connection, and after placing these six in one ABS battery case, a lid was adhered. After that, dilute sulfuric acid was poured from the hole on the top of the lid, a control valve was attached, the upper lid was ultrasonically welded to hold down the valve, and then battery case formation was performed.
A control valve type storage battery of 0 Ah (20 hour rate) was obtained.

These batteries were manufactured according to JIS C 8702-
It was subjected to the float life test described in 1. That is, temperature 2
2.275V per cell, 13.6 per battery at 5 ° C
It is charged at 5 V, and is discharged every two months at a constant current of 2.5 A to 1.7 V per cell (10.2 V per battery), and the discharge capacity is confirmed. In addition,
The life was defined when the discharge capacity became half of the nominal capacity (5 Ah in this example). The test results are shown in Tables 1-3. That is, as shown in the life column of Tables 1 to 3, at least one of the blades of each step is provided in the step height of the upper blade of each step arranged stepwise according to the present invention is half or more of all the steps. The difference in height is 1 to 20% of the height of the cutting edge of the cutting tool on the high side of each step, and the difference in height of the rough cutting edge is further 5 to 15%. By the way, in addition, 2 of each stage
The height of the higher blade tip of the blades 3a, 3b is continuously or stepwise lowered except for the blades on the most upstream side and the most downstream side along the sheet traveling direction. It has become possible to achieve a life performance equal to or higher than the life performance of No. 0.

In addition to this example, similar test results were obtained even when the manufacturing conditions such as the shape of each upper blade, the height of the blade, the number of steps of the upper blade fitting, the lead sheet composition, the lead sheet thickness, etc. were changed. . Further, in the above-mentioned embodiment, the two-blade was described, but the same effect was obtained even when the number of the blades was two or more. As an example, Tables 7 and 8 show the results when the number of blades is three. Here, Table 7 shows the heights of the blades in each step and the results of the battery test similar to the above. In addition, Table 8 shows the state of lattice cells that were expanded.

[0038]

[Table 7]

[0039]

[Table 8]

According to Table 8, even when the number of blades in each step is three, the present invention can reduce or eliminate the variation in the size of the lattice cells.

According to the results of the life test of Table 7, even in the case of the 3-flute, the examination number 0 according to the present invention is the same as the case of the 2-flute.
It has become possible to achieve life performance equivalent to or better than the life performance of No.

Each row of the blades shown in Table 1 may be a single blade, but in this case, two upper blades 3 are different in each step only by the height of the blade edge of the blade 3a. It must be installed and this mounting adjustment can be cumbersome. Therefore, by using a shape in which two blades are integrated (FIG. 3), it becomes possible to eliminate troublesome adjustment.

In the above embodiment, the case where the expanded portions are formed on both sides of the lead sheet 1 has been described. However, the stepped side surface 4a is formed only on one side of the upper blade fitting 4, and the upper blade 3 is provided there. By attaching the lead sheet 1, it is also possible to form only one developed portion on one side.

In the above embodiment, the mesh lateral pitch × height of 20 × average 8 mm has been described, but in addition to this, 20 × average 10 mm and 40 × average 14 mm.
Similar results were obtained for the mm type. That is, the present invention is not limited to this mesh size.

In the above embodiment, the case where the grid 1a of the lead sheet 1 has a long hexagonal shape (diamond shape) has been described, but the shape of the grid is not particularly limited. Moreover, it is not necessary that the shapes of the squares 1a except for the ends are the same. For example, in the present embodiment, with respect to the upper blade 3 of each step, two blades 3a and 3b having the same shape of the cutting edge are provided.
However, if the blades having different blade shapes are also made to have different heights, the shapes of the adjacent cells 1a will be different.

[0046]

As is apparent from the above description, according to the battery grid manufacturing apparatus of the present invention, a grid for improving the corrosion resistance of the expanded grid can be manufactured while the manufacturing speed of the reciprocating expanded grid is increased. A device can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a reciprocal expander.

[Fig. 2] Expanding grid

FIG. 3 Upper blade with two blades

[Fig. 4] Conventional expanded lattice manufactured with two blades

FIG. 5 is a plan view of a reciprocal expander.

FIG. 6 is an enlarged plan view of a reciprocal expander.

FIG. 7 Expanding grid

FIG. 8 Expanding grid

[Explanation of symbols]

1 Lead sheet 1a square 2 Lower blade metal fittings 2a Side of lower blade bracket 3 Upper blade 3a blade (upstream side) 3b blade (downstream side) 4 Upper blade metal fittings 4a Side of upper blade bracket

Claims (3)

[Claims] 1. A notch is formed in a metal alloy sheet by moving a plurality of upper blades arranged stepwise on the lead alloy sheet that moves intermittently in the order from the end along the traveling direction of the alloy sheet. In an apparatus for manufacturing a grid for a storage battery, which is spread at the same time as being put in and leaves a non-expanded portion at the center or the end of the sheet to form a grid in a mesh, the upper blades of each step arranged in a staircase are formed by a metal sheet. Of the blades of two or more blades in the upper blade of each step, and the height of the blade edges of the two or more blades of each step is at least 1 of the blades of each step.
The difference in height is 1 of the height of the cutting edge on the high side of each step.
-20%, The manufacturing apparatus of the grid for storage batteries characterized by the above-mentioned. 2. The highest blade height of the upper blade having two or more blades provided in each step, excluding the upper blade provided in the final or first step, along the sheet traveling direction. 2. The apparatus for manufacturing a storage battery grid according to claim 1, wherein the value gradually decreases along the sheet traveling direction. 3. A storage battery grid manufactured by using the manufacturing apparatus according to claim 1.